equisetum horsetail, snake grass, puzzlegrass is the only living genus in equisetaceae for education.

arvense beetles botanical botany carboniferous close closeup cone decorative detail education elateridae elaters equisetaceae equisetopsida equisetum field fossil genus grass growth herb homosporous horse horsetail hygroscopic laboratory laboratoryn like living macro microphylls microscope microscopic nature only perennial plant plants prothalli puzzle puzzlegrass rosemary rush science scientific scouring snake sporangiophores spore spores stem stereo sterile strobili strobilus tail vascular